There are certain words or phrases in Japanese that just cannot be translated. My friend Lisa and I often say to each other "Daijyobu," which means "everything will be ok," in somewhat dire situations. It's not the same, however, as just saying "it's ok." The word has a nuance that cannot be translated. It's sort of like "things will work out for the best...take it lightheartedly...I'm here for you...we'll look back at this and laugh one day..."
Here are a few other
Japanese words without a direct translation in English.